переодически падает squid с сообщением:
FATAL: xcalloc: Unable to allocate 2 blocks of 4096 bytes!

настройки такие:
cache_mem 700 MB
cache_dir ufs /usr/local/squid/var/cache1 20480 16 256
cache_dir ufs /usr/local/squid/var/cache2 30720 16 256

количество объектов в кеше:
Finished rebuilding storage from disk.
   2656520 Entries scanned
         0 Invalid entries.
         0 With invalid flags.
   2651452 Objects loaded.
         0 Objects expired.
      3153 Objects cancelled.
      9292 Duplicate URLs purged.
       774 Swapfile clashes avoided.
   Took 41.9 seconds (63271.4 objects/sec).

Есть идеи?